Salmo obtusirostris salonitana (also termed by the common names Solin salmon or Solinka and the scientific synonym Salmothymus

Salmothymus

Salmothymus is a genus name of fish in the Salmonidae family, established for the Adriatic trout . More commonly, however, the species is considered a member of the wider genus Salmo, i.e. Salmo obtusirostris. Salmothymus thus is a junior synonym of Salmo, not in current use....

 obtusirostris salonitana) is an endemic trout

Trout

Trout is the name for a number of species of freshwater and saltwater fish belonging to the Salmoninae subfamily of the family Salmonidae. Salmon belong to the same family as trout. Most salmon species spend almost all their lives in salt water...

 subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 found in the Jadro River

Jadro River

The Jadro River is a watercourse in Dalmatia, Croatia that discharges to the Adriatic Sea. The upper reaches of the Jadro River as well as its source are protected as an ichthyological nature reserve, partly due to the presence of an endemic species of soft-mouthed trout...

 in the vicinity of Solin (Dalmatia

Dalmatia

Dalmatia is a historical region on the eastern coast of the Adriatic Sea. It stretches from the island of Rab in the northwest to the Bay of Kotor in the southeast. The hinterland, the Dalmatian Zagora, ranges from fifty kilometers in width in the north to just a few kilometers in the south....

, Croatia

Croatia

Croatia , officially the Republic of Croatia , is a unitary democratic parliamentary republic in Europe at the crossroads of the Mitteleuropa, the Balkans, and the Mediterranean. Its capital and largest city is Zagreb. The country is divided into 20 counties and the city of Zagreb. Croatia covers ...

), and in the nearby Žrnovnica River. The upper reaches of the Jadro River including Jadro Spring

Jadro Spring

The Jadro Spring is a water source rising in the Dinaric Alps in Croatia. The spring was the original water supply for the ancient city comprised by Diocletian's Palace . Contemporary studies indicate favourable water quality levels at the spring source. The Jadro Spring is the source of the...

 have been protected since the year 1984, partially due to the presence of this endangered fish species, S. o. salonitana. Over 59 percent of the freshwater fishes of Croatia are classified as endangered. The waters of the Jadro River have been diverted since antiquity, supplying water to Diocletian's Palace

Diocletian's Palace

Diocletian's Palace is a building in Split, Croatia, that was built by the Roman emperor Diocletian at the turn of the fourth century AD.Diocletian built the massive palace in preparation for his retirement on 1 May 305 AD. It lies in a bay on the south side of a short peninsula running out from...

 as early as the third century AD.
This fish species is thought to be endangered not only by historic river diversions, but by increasing urbanisation, overfishing

Overfishing

Overfishing occurs when fishing activities reduce fish stocks below an acceptable level. This can occur in any body of water from a pond to the oceans....

 and by the presence of the Rainbow Trout

Rainbow trout

The rainbow trout is a species of salmonid native to tributaries of the Pacific Ocean in Asia and North America. The steelhead is a sea run rainbow trout usually returning to freshwater to spawn after 2 to 3 years at sea. In other words, rainbow trout and steelhead trout are the same species....

.